Think button in ChatGPT

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Pictures from our ChatGPT account (Free plan), on the web, 26 Oct 2026. Your screen may look different on another plan or device, or after an update.

Open a new chat.
Open the whole screen for step 1.
Type the word problem.
A train leaves a station at 3:00 pm going 60 km/h. A second train leaves the same station at 4:00 pm on the same track going 90 km/h. At what time does the second train catch the first, and how far from the station? Show short working.
Open the whole screen for step 2.
Send the problem.
Open the whole screen for step 3.
You see a four-step train problem answer.
Start a new chat, switch on Think and send the same problem.
A train leaves a station at 3:00 pm going 60 km/h. A second train leaves the same station at 4:00 pm on the same track going 90 km/h. At what time does the second train catch the first, and how far from the station? Show short working.
Open the whole screen for step 4.
You see a three-step answer with the Think button switched on.

Click a picture to see it full size.